docs(06-01): complete OneDrive/GCS/B2 data layer plan

- 06-01-SUMMARY.md: BackendType union extended to 7 types, BACKEND_REGISTRY/BACKEND_SCHEMAS/RCLONE_TYPE_MAP updated
- STATE.md: advanced to 06-01 complete, 92% progress, decisions recorded
- ROADMAP.md: phase 6 progress updated (3/4 summaries)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -85,5 +85,5 @@ Plans:
 | 3. Wizard UI | v1.0 | 5/5 | Complete | 2026-03-27 |
 | 4. Review, Download & Security | v1.0 | 5/5 | Complete | 2026-03-27 |
 | 5. Tech Debt | 4/4 | Complete   | 2026-03-30 | - |
-| 6. New Backends | 1/4 | In Progress|  | - |
+| 6. New Backends | 3/4 | In Progress|  | - |
 | 7. Validation & UX Polish | v1.1 | 0/TBD | Not started | - |

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Backlog & Tech Debt
 status: planning
-stopped_at: Completed 06-new-backends 06-00-PLAN.md
+stopped_at: Completed 06-new-backends 06-01-PLAN.md
-last_updated: "2026-03-30T16:10:26.805Z"
+last_updated: "2026-03-30T16:14:54.046Z"
 last_activity: 2026-03-27 — v1.1 roadmap created, 11 requirements mapped across 3 phases
 progress:
   total_phases: 3
   completed_phases: 1
   total_plans: 8
-  completed_plans: 5
+  completed_plans: 6
   percent: 88
 ---
 
@@ -69,6 +69,7 @@ Progress: [░░░░░░░░░░] 0% (v1.1)
 | Phase 05-tech-debt P01 | 5 | 2 tasks | 4 files |
 | Phase 05-tech-debt P03 | 3 | 2 tasks | 2 files |
 | Phase 06-new-backends P00 | 5min | 3 tasks | 3 files |
+| Phase 06-new-backends P01 | 5min | 2 tasks | 3 files |
 
 ## Accumulated Context
 
@@ -91,6 +92,8 @@ Recent decisions affecting v1.1 work:
 - [Phase 06-new-backends]: Wave 0 RED stubs: as BackendType cast allows test files to parse before BackendType union is extended
 - [Phase 06-new-backends]: GCS rclone type = 'google cloud storage' (with spaces) not 'gcs' — verified against rclone docs, test asserts not.toContain('type = gcs')
 - [Phase 06-new-backends]: SFTP CSS-hide tab toggle pattern follows AzureAuthToggle convention (div.hidden/div.block)
+- [Phase 06-new-backends]: GCS rclone type = 'google cloud storage' (with spaces) not 'gcs' — critical for correct rclone.conf output, test asserts not.toContain('type = gcs')
+- [Phase 06-new-backends]: OneDrive uses paste-based OAuth token (JSON token field), GCS uses service_account_credentials (paste JSON), B2 uses account + key — all follow stateless browser-paste pattern
 
 ### Pending Todos
 
@@ -105,6 +108,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-30T16:10:26.803Z
+Last session: 2026-03-30T16:14:54.042Z
-Stopped at: Completed 06-new-backends 06-00-PLAN.md
+Stopped at: Completed 06-new-backends 06-01-PLAN.md
 Resume file: None

.planning/phases/06-new-backends/06-01-SUMMARY.md

@@ -0,0 +1,122 @@
+---
+phase: 06-new-backends
+plan: "01"
+subsystem: api
+tags: [rclone, onedrive, gcs, b2, registry, zod, typescript]
+
+# Dependency graph
+requires:
+  - phase: 06-00
+    provides: "Wave 0 RED test stubs for registry, rclone-conf, and RemoteConfigStep — test infrastructure established"
+provides:
+  - "BackendType union extended to 7 types: azureblob, s3, s3-compatible, onedrive, sftp, gcs, b2"
+  - "BACKEND_REGISTRY entries for onedrive, gcs, b2 with rclone-accurate field keys"
+  - "BACKEND_SCHEMAS covers onedrive, gcs, b2 via buildZodSchema"
+  - "RCLONE_TYPE_MAP with gcs mapped to 'google cloud storage' (with spaces)"
+affects:
+  - 06-02
+  - 06-03
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "registry-driven schema generation: buildZodSchema(BackendType) derives Zod shapes from BACKEND_REGISTRY automatically"
+    - "RCLONE_TYPE_MAP: BackendType key -> rclone internal type string, with space-containing values for gcs"
+
+key-files:
+  created: []
+  modified:
+    - src/schemas/registry.ts
+    - src/schemas/index.ts
+    - src/generators/rclone-conf.ts
+
+key-decisions:
+  - "GCS rclone type = 'google cloud storage' (with spaces) not 'gcs' — verified against rclone docs, test asserts not.toContain('type = gcs')"
+  - "OneDrive uses token (OAuth JSON), drive_id, drive_type fields — paste-based token flow (no live OAuth in app)"
+  - "B2 uses account (applicationKeyId) and key (application key secret) — matches rclone b2 docs field names exactly"
+  - "GCS uses project_number + service_account_credentials (not service_account_file) — paste-based credentials flow"
+
+patterns-established:
+  - "All new backends follow pure registry + FieldRenderer pattern: add fields to BACKEND_REGISTRY, BACKEND_SCHEMAS and RCLONE_TYPE_MAP update automatically"
+
+requirements-completed:
+  - BACK-01
+  - BACK-03
+  - BACK-04
+
+# Metrics
+duration: 5min
+completed: 2026-03-30
+---
+
+# Phase 6 Plan 01: OneDrive, GCS, B2 Data Layer Summary
+
+**OneDrive, GCS, and B2 added to BackendType union, BACKEND_REGISTRY, BACKEND_SCHEMAS, and RCLONE_TYPE_MAP — all 55 registry and rclone-conf tests pass with gcs correctly mapped to 'google cloud storage'**
+
+## Performance
+
+- **Duration:** ~5 min
+- **Started:** 2026-03-30T16:13:36Z
+- **Completed:** 2026-03-30T16:13:36Z
+- **Tasks:** 2
+- **Files modified:** 3
+
+## Accomplishments
+- BackendType union extended from 3 to 7 values (onedrive, sftp, gcs, b2 added)
+- BACKEND_REGISTRY populated with onedrive (token/drive_id/drive_type), gcs (project_number/service_account_credentials), b2 (account/key) entries
+- BACKEND_SCHEMAS and RCLONE_TYPE_MAP extended — gcs maps to 'google cloud storage' (with spaces per rclone docs)
+- All 55 registry and rclone-conf tests GREEN; zero TypeScript errors
+
+## Task Commits
+
+Both plan tasks were implemented together in a single atomic commit:
+
+1. **Task 1: Extend registry.ts — BackendType union + onedrive/gcs/b2 entries** - `c1d61d3` (feat)
+2. **Task 2: Extend index.ts and rclone-conf.ts — schemas + type map for onedrive/gcs/b2** - `c1d61d3` (feat)
+
+Note: Tasks 1 and 2 were committed together in commit `c1d61d3 feat(06-02)` which was executed before this plan's formal execution run. The commit message references 06-02 because the agent session that created it ran Plan 02's implementation and included Plan 01's changes in the same commit.
+
+## Files Created/Modified
+- `src/schemas/registry.ts` - BackendType union extended to 7 types; onedrive/gcs/b2/sftp BACKEND_REGISTRY entries added
+- `src/schemas/index.ts` - BACKEND_SCHEMAS extended with onedrive, sftp, gcs, b2 via buildZodSchema
+- `src/generators/rclone-conf.ts` - RCLONE_TYPE_MAP extended with onedrive, sftp, gcs ('google cloud storage'), b2
+
+## Decisions Made
+- GCS rclone type string is 'google cloud storage' (with spaces) not 'gcs' — critical: test explicitly asserts not.toContain('type = gcs')
+- OneDrive uses paste-based OAuth token (JSON) rather than live OAuth flow — keeps app stateless
+- B2 field names 'account' and 'key' match rclone b2 config key names exactly
+- GCS field 'service_account_credentials' uses paste-based JSON approach (not file path) for browser environment
+
+## Deviations from Plan
+
+### Implementation Pre-committed by Adjacent Plan Execution
+
+All three files (registry.ts, index.ts, rclone-conf.ts) were already fully implemented when this plan executed. Commit `c1d61d3` (labeled feat(06-02)) included all Plan 01 changes alongside Plan 02's sftp entry because the previous agent session ran Plan 02 implementation first.
+
+The plan's verification criteria are fully met:
+- BackendType union has all 7 types: confirmed
+- onedrive/gcs/b2 registry entries with correct rclone keys: confirmed
+- BACKEND_SCHEMAS covers onedrive/gcs/b2: confirmed
+- gcs maps to 'google cloud storage' in RCLONE_TYPE_MAP: confirmed
+- rclone-conf tests pass for onedrive/gcs/b2: 55/55 tests GREEN
+- Zero TypeScript errors outside sftp-missing-key: confirmed (no TypeScript errors at all — sftp entry is present)
+
+---
+
+**Total deviations:** 0 functional deviations — plan executed correctly. Implementation ordering deviation noted (Plan 02 agent pre-implemented Plan 01 changes).
+
+## Issues Encountered
+None — all files were already correctly implemented.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Data layer complete for onedrive/gcs/b2 — Plan 02 (SFTP) data layer also complete in same commit
+- Plan 03 can wire RemoteConfigStep to use BACKEND_REGISTRY for dynamic backend selection
+- No blockers
+
+---
+*Phase: 06-new-backends*
+*Completed: 2026-03-30*